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Questions  

 The range of the   y=x24 is

 

a
(0,∞)
b
0,∞
c
−∞,−2∪2,∞
d
None of these

detailed solution

Correct option is B

(i) x2−4 Least value of square root is 0 when x2=4 or x=±2 .  Also, x2−4≥0 Hence, x2−4∈[0,∞)

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